US5757846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CDMA communication system and method with dual-mode receiver
Assignee: Comcast MO Group Inc
•
Filing: 1996-08-30
•
Granted: 1998-05-26
•
Expires: 2016-08-30
Abstract
Abstract A CDMA communication method and system including a receiver that operates in one of two modes, switching between non-coherent and coherent reception on the basis of a channel quality indicator. An important application of this technique would be over the reverse link (from user to base station) of a CDMA system based on the IS-95 cellular standard or the PN-3384 PCS standard.
Inventors
- 👤 Subramanian Vasudevan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:09
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A method of detecting a received Code Division Multiple Access signal comprising the steps of: estimating the channel coefficients of the received signal; detecting the signal using a coherent mode of operation if the channel coefficient estimates are reliable according to a predetermined reliability indicator; and detecting the signal using a non-coherent mode of operation if the channel coefficient estimates are not reliable according to said predetermined reliability indicator, wherein the reliability indicator is an available system parameter that provides an indirect assessment of channel stability, said system parameter comprising one of the following: a value of a frame quality indicator, a variance of a transmit gain adjust, or a variance of power control bits.
Claim 2
Independent Claim
115 words
A method of detecting a received Code Division Multiple Access signal comprising the steps of: estimating the channel coefficients of the received signal; detecting the signal using a coherent mode of operation if the channel coefficient estimates are reliable according to a predetermined reliability indicator; and detecting the signal using a non-coherent mode of operation if the channel coefficient estimates are not reliable according to said predetermined reliability indicator, wherein the reliability indicator is an available system parameter that provides an indirect assessment of channel stability, said system parameter comprising one of the following: a value of a frame quality indicator, a variance of a transmit gain adjust, or a variance of power control bits.
Claim 3
Dependent Claim
16 words
The method according to claim 1 wherein the system defaults to a non-coherent mode of operation.
Claim 4
Dependent Claim
134 words
A receiver for detecting information contained in a spread-spectrum signal comprising: an estimator for estimating the channel coefficients of the signal received; a controller for determining the reliability of the channel coefficient estimates according to a predetermined reliability indicator; a detector for detecting the signal using a coherent mode of operation if the channel coefficient estimates are reliable according to a predetermined reliability indicator, and for detecting the signal using a non-coherent mode of operation if the channel coefficient estimates are unreliable according to said predetermined reliability indicator, wherein the reliability indicator is an available receiver parameter that provides an indirect assessment of channel stability, said receiver parameter comprising one of the following: a value of a frame quality indicator, a variance of a transmit gain adjust, or a variance of power control bits.
Claim 5
Dependent Claim
134 words
A receiver for detecting information contained in a spread-spectrum signal comprising: an estimator for estimating the channel coefficients of the signal received; a controller for determining the reliability of the channel coefficient estimates according to a predetermined reliability indicator; a detector for detecting the signal using a coherent mode of operation if the channel coefficient estimates are reliable according to a predetermined reliability indicator, and for detecting the signal using a non-coherent mode of operation if the channel coefficient estimates are unreliable according to said predetermined reliability indicator, wherein the reliability indicator is an available receiver parameter that provides an indirect assessment of channel stability, said receiver parameter comprising one of the following: a value of a frame quality indicator, a variance of a transmit gain adjust, or a variance of power control bits.
Claim 6
Dependent Claim
16 words
The receiver according to claim 3 wherein the receiver defaults to a non-coherent mode of operation.
References Cited (Backward Citations)
US5150378A
Cited
US5239557A
Cited
US5329547A
Cited
US5305349A
Cited
US5361276A
Cited
US5446727A
Cited
US5619524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |